"""
Licensed to the Apache Software Foundation (ASF) under one
or more contributor license agreements.  See the NOTICE file
distributed with this work for additional information
regarding copyright ownership.  The ASF licenses this file
to you under the Apache License, Version 2.0 (the
"License"); you may not use this file except in compliance
with the License.  You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

Ambari Agent

"""

from resource_management import *
from ambari_commons.os_family_impl import OsFamilyFuncImpl, OsFamilyImpl
from ambari_commons import OSConst

@OsFamilyFuncImpl(os_family=OSConst.WINSRV_FAMILY)
def service(componentName, action='start', serviceName='yarn'):
  import status_params
  if status_params.service_map.has_key(componentName):
    service_name = status_params.service_map[componentName]
    if action == 'start' or action == 'stop':
      Service(service_name, action=action)
    elif action == 'status':
      check_windows_service_status(service_name)


@OsFamilyFuncImpl(os_family=OsFamilyImpl.DEFAULT)
def service(componentName, action='start', serviceName='yarn'):
  import params

  if serviceName == 'mapreduce' and componentName == 'historyserver':
    delete_pid_file = True
    daemon = format("{mapred_bin}/mr-jobhistory-daemon.sh")
    pid_file = format("{mapred_pid_dir}/mapred-{mapred_user}-{componentName}.pid")
    usr = params.mapred_user
  else:
    # !!! yarn-daemon.sh deletes the PID for us; if we remove it the script
    # may not work correctly when stopping the service
    delete_pid_file = False
    daemon = format("{yarn_bin}/yarn-daemon.sh")
    pid_file = format("{yarn_pid_dir}/yarn-{yarn_user}-{componentName}.pid")
    usr = params.yarn_user

  cmd = format("export HADOOP_LIBEXEC_DIR={hadoop_libexec_dir} && {daemon} --config {hadoop_conf_dir}")

  if action == 'start':
    daemon_cmd = format("{ulimit_cmd} {cmd} start {componentName}")
    check_process = format("ls {pid_file} >/dev/null 2>&1 && ps -p `cat {pid_file}` >/dev/null 2>&1")

    # Remove the pid file if its corresponding process is not running.
    File(pid_file, action = "delete", not_if = check_process)

    # Attempt to start the process. Internally, this is skipped if the process is already running.
    Execute(daemon_cmd, user = usr, not_if = check_process)

    # Ensure that the process with the expected PID exists.
    Execute(check_process,
            user=usr,
            not_if = check_process,
            tries=5,
            try_sleep=1,
    )

  elif action == 'stop':
    daemon_cmd = format("{cmd} stop {componentName}")
    Execute(daemon_cmd, user=usr)

    # !!! yarn-daemon doesn't need us to delete PIDs
    if delete_pid_file is True:
      File(pid_file, action="delete")


  elif action == 'refreshQueues':
    rm_kinit_cmd = params.rm_kinit_cmd
    refresh_cmd = format("{rm_kinit_cmd} export HADOOP_LIBEXEC_DIR={hadoop_libexec_dir} && {yarn_container_bin}/yarn rmadmin -refreshQueues")
    Execute(refresh_cmd, user=usr)
